5 valves / VVL ???

[darkjedi]

yes, you are right. i think i was looking at the All CVVT variocam from newer cars. variocam plus does have VVL.

[Shrike]

The 4age 20v by toyota has vvt
The 2zzge has vvti

VVT is controlled by a solenoid that lets oil in to change the cam duration

[euniqe]

Alfa Romeo introduced the world's first hydraulicly-activated production valvetrain. There's an extra cam lobe on the end of the exhaust cam (which is a normal cam) which drives hydraulic actuators that control the intake valves. The actuators are adjustable, and allow for infinitely variable valve timing and lift. Yes, that's right, INFINITE adjustment. (iirc)

Not far down the line, all cars will have similar systems. A little bit further, if not even before, we will see cars that have infinitely adjustable valve timing and lift on all valves, on all cams. Yes, BMW have their "valvetronic" system, but this by design has severe restrictions at high RPMs and still uses mechanical valve actuators.

However, like the BMW system, the valvetrains of the future will allow for the valvetrain to be used as the throttle, deleting butterfly valves and improving performance across all of the revs. It will also allow for different timings and lift PER CYLINDER, so that cylinders that receive different air/fuel ratios and amounts due to intake design can be accounted for and adjusted accordingly.

The sky will soon be the limit for valvetrain adjustment, and imo within 10-20 years. It will mark GIGANTIC increases in internal combustion efficiency, and will be available for all types of valvetrain. I'm excited.

[Leximu]

Note that for example Toyota went from the 20V 4AGE (1.6, 118kw) to the 16V 2GZZE (1.8, 140kw) seemingly so they could run VVL and get more power out of it, so 16V with VVL can indeed be better for power than 20V.

haha awesome corolla reference. XD and mind you those engines were TANKS... it took us 80,000 kilometers to kill it..... without oil, and a compressionless 4th cylinder ( spark plug blew out.. due to over rev. hehe.) . running with a carb... ( oh I mean kill it in terms before we got a new and improved awesome engine !... haha. still runs >.> and if asked, we respond, it comes out of the factory like that.)